/*
 * JBoss, Home of Professional Open Source
 * Copyright 2013, Red Hat, Inc. and/or its affiliates, and individual
 * contributors by the @Posts tag. See the copyright.txt in the
 * distribution for a full listing of individual contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package at.fhj.itm11.forum.data;

import javax.enterprise.context.ApplicationScoped;
import javax.inject.Inject;
import javax.persistence.EntityManager;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Root;

import java.util.List;

import at.fhj.itm11.forum.model.Post;

/**
 * @author Mario Kullnigg
 * @author Jürgen Kiendler
 **/

@ApplicationScoped
public class PostRepository {

    @Inject
    private EntityManager em;

    public Post findById(Long id) {
        return em.find(Post.class, id);
    }

    public Post findByEmail(String email) {
        CriteriaBuilder cb = em.getCriteriaBuilder();
        CriteriaQuery<Post> criteria = cb.createQuery(Post.class);
        Root<Post> Post = criteria.from(Post.class);
        // Swap criteria statements if you would like to try out type-safe criteria queries, a new
        // feature in JPA 2.0
        // criteria.select(Post).where(cb.equal(Post.get(Post_.email), email));
        criteria.select(Post).where(cb.equal(Post.get("email"), email));
        return em.createQuery(criteria).getSingleResult();
    }

    public List<Post> findAllOrderedByName() {
        CriteriaBuilder cb = em.getCriteriaBuilder();
        CriteriaQuery<Post> criteria = cb.createQuery(Post.class);
        Root<Post> Post = criteria.from(Post.class);
        // Swap criteria statements if you would like to try out type-safe criteria queries, a new
        // feature in JPA 2.0
        // criteria.select(Post).orderBy(cb.asc(Post.get(Post_.name)));
        criteria.select(Post).orderBy(cb.asc(Post.get("name")));
        return em.createQuery(criteria).getResultList();
    }
    
    public List<Post> findPostsByTopic(long topicId) {
    	CriteriaBuilder cb = em.getCriteriaBuilder();
        CriteriaQuery<Post> criteria = cb.createQuery(Post.class);
        Root<Post> post = criteria.from(Post.class);
        
        criteria.select(post).where(cb.equal(post.get("topic"), topicId));
        criteria.orderBy(cb.desc(post.get("date")));
        return em.createQuery(criteria).getResultList();
    	
    }
}
